New Prequel Book! Order of the Stick: Good Deeds Gone Unpunished (Book 1/2)

[The Giant]

What does the "GenCon pickup 2018" option mean? I mean, it can't mean "go to Gen Con and pick it up", or else it wouldn't be shipping, but what does it do and why is it so much cheaper?

That is literally what it means: you go to GenCon and pick it up in person from the Ookoodook booth. It's "shipping" because it's a limited website and the option has to be put in there in a way that the system understands.